If an interaction target includes a child and an adult, and if an interaction amount is greater than or equal to a threshold, a robot asks the adult if the adult allows the robot to continue interacting with the child. If the target includes the child and the adult, and if the interaction amount is less than the threshold, the robot requests to the adult that the adult and the child continue interacting with the robot. If the target includes only the child, and if the interaction amount is greater than or equal to the threshold, the robot stops interacting with the child. If the target includes only the child, and if the interaction amount is less than the threshold, the robot leads the child to continue interacting with the robot.

A robot control device (a communication terminal) is a robot control device controlling a student robot playing a role of a student learning with a user and includes acquirer (a learning performance acquirer) that acquires an indicator presenting academic ability of the user, determiner (a student robot operation controller) that determines an operation of the student robot based on the indicator presenting the academic ability of the user acquired by the acquirer, and executor (the student robot operation controller) that makes the student robot execute the operation determined by the determiner.

A motion system for allowing a person to cause a desired motion operation to be performed, comprising a network, a motion machine, a speech to text converter, a message protocol generator, an instant message receiver, and a motion services system. The motion machine is capable of performing motion operations. The speech to text converter generates a digital representation of a spoken motion message spoken by the person. The message protocol generator generates a digital motion command based on the digital representation of the spoken motion message and causes the digital motion command to be transmitted over the network. The instant message receiver receives the digital motion command. The motion services system causes the motion machine to perform the desired motion operation based on the digital motion command received by the instant message receiver.